I'm trying to make a sort of functional tokamak, but I can't find anything good to use for the magnetic coils. I tried two rings of RPEL, but that didn't contain the heat :/
You could use a ring of HEAC to pull the heat away to some radiators with LN2 generators next to them. Check out this video for an example of what I am suggesting: https://youtu.be/CbBgs-W6NLo